Thanks for the suggestions. When this problem first occurred I detached the coax (from a TV antennae which I don’t use anymore) and didn’t solve it. I then put cheater plugs on all 3 prong outlets. No luck. I then put RCA “dummy” plugs into everything on the pre-amp not used. I then put RF ferrite clamps on damn near everything. It was then I called an electrician to have a separate, dedicated line put in and had him check the ground outside the house. I’ve used this electrician many times over the years and he is really good and understood my issue so spent a lot of time testing all the electrical. I then had a CEDIA certified installer come out to essentially “rebuild” the system one component at a time. He couldn’t pinpoint the issue but suspected EMI/RF and suggested I use shielded RCA cable. So…I sent all my RCA cables back to the manufacturer to have shielded. No luck and the sound field “collapsed”. They told me this could happen so I have subsequently had them sent back to be “un-shielded”. So, those are the steps taken over the last year. I will say there seem to be days it’s worse and some days better. I will try some of the suggestions here but I have thrown so much time and money into this I almost want to throw in the towel and just live with it. In addition to the suggestions here - some of which I have not tried - I ordered the “faraday” fabric which I posted before. This won’t be in until the end of April though. But is was only $30 so what the Hell… I don’t know I technically adept enough to want to try the suggestion you had Steve about stripping the wire and attaching it to the preamp. My luck I’d have a bad result. That said, I will try several of these steps over the weekend - specifically turning off all the circuits except for the system and changing out where the subwoofer is plugged in. Currently the sub is plugged into a Panamax (which is plugged into the Furman). I had to do it this way because the sun power cable does t reach the Furman and the Panamax power cable doesn’t reach the wall outlet. I’m thinking a heavy duty extension cord - like for power tools you find at Home Depot - and try using that to extend to the Panamax from the outlet. Anyway, thx for the suggestions and I’ll report back.
Another buzz issue
Hi All, I recently updated my preamp to a Marantz AV7706. The Marantz has a 2 prong plug and after extensive trial and error have determined the hum must be a grounding issue. I have separate amps on all channels (a total of 4 amps with 3-prong plugs and a Marantz, 6 channel amp powering 3 pair of overhead fronts, sides and overhead rears for (ATMOS) configuration that, like the preamp, has a 2 prong plug. I don’t want to put cheater plugs on ALL of my 3 prong plugs so was wondering if/how it’s possible to “ground” - or convert - the 2 prong plugs to 3 prong? FWIW - I have a dedicated circuit for the HT/sound system, almost everything is plugged into a Furman AC “conditioner” and all plugged into the same circuit. There are NO coax runs. I’m sure there is another thread on this topic somewhere but am looking for guidance. Also, all the interconnects are in shielded, RCA (my 4 old Hafler 9300’s don’t take XLR). To rule out the cables I put in some old AQ shielded cables with no luck. I will also mention that there are a few auxiliary components (subwoofer, Amazon cube and and Apple TV that are plugged into a Panamax which is plugged into the same outlet/circuit - I just don’t have any more outlets available on the Furman. I have tried to troubleshoot this for over a year and have had 2 installers come out with no luck. At first I thought there was a problem with the Marantz but swapped it out for a new one (same model) so doubt that’s the issue.
- ...
- 10 posts total
- 10 posts total